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I've been doing 20L or about 5.28 gallons of water change per week. I have a 30 gallon aquarium. Is this a good amount? Also I let the water get room temperature, but I'm wondering how the temperature variation will affect the fish when I'm putting in the water. My temp goes from about 76.4 to about 77.7 depending on how hot it is in the house. We do have A/C but our house temperature flucuates as well. My aquarium is not near any windows or heating/ac vents.

Last edited by keziahamber : 08-06-2010 at 12:23 PM.
Reason: added more to my question

Well, temperature wise some fish like it warmer, others like it cooler. For a general guide to go by I use this site AqAdvisor for selecting fish compatible with my tank and current fish. It will give recommended water temperatures, a recommended water change percent, and so on. It may not be perfect but it's been a great guide for me to go on.

That's not a big difference in temp. so I wouldn't worry about it. I normally do about %20 in my 55g tank when I do a water change. That's because I like to go overtop all the gravel to get excess food and waste from the bottom.